The IP is one from the company from which I rent this server. However, I do not have Plesk installed on my system. The hosting company (Amen) installs the OS of your choice for you with or without Plesk. I didn't install Plesk and installed myself virtualmin instead.

Does that mean that my server is configured to be upgraded only by their internal repo? If so, how can I change that?

1 Answer
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Plesk is the control panel running on your system. There are likely many dependencies on Plesk and custom binaries installed the the Plesk software relies on. Thus, it looks like Plesk uses a repository to manage all this.

According to the Plesk website (http://www.parallels.com/products/plesk/reqs/) Plesk 10 is supported on 10.04. I would check with Plesk on the proper upgrade procedures. The repository appears to be at http://autoinstall.plesk.com/PSA_10.0.1/dist-deb-Ubuntu-10.04-i386/. But it wouldn't be wise to just change the repository URL in /etc/apt/sources.list or /etc/apt/sources.list.d without backing up the machine first.

Update:

If you are not using Plesk then it looks like their repository list erroneously includes the Plesk binaries. If this is just plain Ubuntu 8.04 then you should be able to modify the /etc/apt/sources.list to include the default Ubuntu repositories:

For 8.04 you will want to replace all instances of 'lucid' with 'hardy'. Then do-release-upgrade should be able to check for new releases. I have never tried this upgrade method. But it should also update your apt sources.list to lucid for you in the process I would imagine.